Refrigerating apparatus



Nov. l, 1932. O, M SUMMERS 1,885,783

REFRIGERATING APPARATUS Filed May 30, 1928 2 Sheets-Sheet l Nov. l, 1932. o. M. suMMERs REFRIGERATING APPARATUS Filed May 30. 1928 2 Sheets-Sheet 2 (5f). wel

lia

Femme@ New@ i@ 1932 and more mie-ieu- 1 iis-ed 'for eenieigemiing meeiiuin.

invention is mpi-@Vide e, ce? eeni'eiiing 'She @ow iiedinm which An ei ebjieei; ef this invenjien is Le pro Vide es se; lgeeifaing si stein ineiueiing e ceniireing mechanism which is afiepfied 'ge Wiehs'tend si piessues eiieeiieey in the sys- Wieiimit the peints ef 'h-e cnnnseciienism? er Witheet {iisim'bance @f iis eeiibe'lzlem en@ edyenmwes 0 'plesent in enii n Wiii Fee appeenf fiom die oiiewing" sien, ieieienee being nad i@ Le eeeeinpen ing drawings, wherein e, pie

.d i is side View in eieyetien a eoniiei ieeiiin ne features if my invention;

Fig: 2 shows sienei View el? the Cenis@ eeienism Wien i e device in *aile pesiiien immediately eiieuie;

Fig., 3 is siiniiei e@ 2 showing the device when subjeeeei i@ ebnoiinei pressui'es and iiiiistmiing lehe ineens used iepi'event damage '-iie device;

Fig". Li iiiusteeies e iefiig'eie'iing sysieni eniionciying eeiiies of my inyenzien; en@

Fig. 5 is e emss-see'iionei View einng iiie iine ef 3,

in iie opei'etien of ieiiigereiing sysi'fems, er insieme of die compressor-condensereiipandei type such :is is diamefnriceiiy iepesenefi in 4i., ziie Telfiigereing medium, ei* exmnpie sulphur (iieyfide9 eyepoi'etes in en evapm'aoi, indicaied by l0 which, with 'the eoiis li, eensiiutes the reirigeieting eiemeni of ih@ system. The :refrigerant is sup plied in ihe wapogra'or i0, in this pariieniar einbodimen, by means 0:5 e compressor i2 e eieebed by s ineoi i5 Wiiieii eiees @the ieiigeiiinih im@ eendensei 13 and ieeeiyei Ma, whence if@ eniers ehe evenee'ioi i0 .iirengii pipe ifi. is wiiheiiewii foin iii-ie eyepei'a 'wi' l() 'biiieugii pipes i? and is i"'e 'turned is ehe Con/i` ei', ii this piiiieuiei einbadiment7 ehieugh idee emnkeese @i$` eieifin enniei ehe epeietion of ehe eeinpiesses in eceoiiience Wiii the ieqnizemens ef iii-ie i-eiiigeieting sentirei device is pim/ide@9 which7 f i' eiieinniisiej eempiises :i switch eeniieiiiiig `Aiie eiieuii sie @the meier used. im" didi/ing iie eeinpressoi. This switch, having coniecs inciiceed by l? and 18, is npemeci ny means of e ieyei' sysneni i9 connected i@ e piessuie iespeiisive deyiee such es a disiphiegin ei' ai beiie'ws 20 conn-eeteii 'ie the eeiiigei'ssingg eiieiiit.

-n :the eensiineiion e eeniroi devices iiis 'type in which s @essuie-responsive eiemen; ei." Ceniainei is 1used foi epein'sing eenizicts, difficulty has been eiipeiieneeei be csuse eiE damage im 'the expensibie eiemeni; Caused by ebnoimsi ni'eesnires7 such es @eene iiuiing shipping 0i storage ef 'die iesigeiefing eppsraiius ei' syseni. Tfhen the sysiem in nei'mei (Were-'Lien7 elle eemniessei pee'- eiiicziiiy iifiiews iefiigeiei e fiom jine eyepmaof il) a sise i; A snie above e, feJinin Heime- YLiiefi system is nefs in nei'mei epeieiim9 es duiine siiipmen 0i? wiege, @Lie eonpiesse' is not in peiieeiie Operation, the ieirigemiiing eieineni ei" eeeiing uni'sweiins up :imi eiesies a high pressure eonciigien Within the sys ein. This pressuie may biiiid up i0 sueii an eziten'i; i5; diefomns lie expensibie memiiei' end @mises ie te take e eieiniie permaneni se. Dai-mage may eis@ be sensed by semining e?? fthe swiieii eeinsiing ieveis er other paris.

By means of the piesen; invention, means is provided i501# preveniing damage te the expensiifsie member anni ie @they eiemenis of die swiich. This ineens may comprise a niouniing for e, swiich member upon e yielding' pialform or framework, ehe arrangement being so constructed and arranged that during the normai @peraion @f the system, the switch acts in the ordinary manner, but

upon the occurrence of excessive pressures the yielding nature of the mounting prevents damage to the parts by relieving the strain caused by such pressures.

As a specific embodiment, the member for controlling the starting and stopping of a refrigerating system embodying features of my invention may be a switch having certain features shown in Figs. 1, 2, 3 and 5 inclusive. In general, the switch may comprise a base 100 provided with pedestals 101 for attaching the switch to any desired portion of the refrigerating system. A pressure-responsive element 20, such as a collapsible cap sule or bellows, may be mounted on the base 100 and may be secured thereto by means of the nut 102 threaded on the portion 103 of the pipe 21. A reinforcing plate 104 may be placed under a portion of the base 100. 1n order to provide the abnormal pressure yielding means, an elevated platform 105 may be carried by the platform 100 and may be secured thereto by bolts 106 provided with spacing sleeves 107 for properly spacing the platform 105 from the base 100. Thepressure-responsive element 20 operates the switch contacts, for instance, through a lever 22 by means of the link-25 which may be attached to the' plate 23 which in turn may be attached to the upper end of the pressureresponsive element 20. A second platform 108 may be placed on top of the platform 105. This platform may be normally held in contact with the platform 105 by means of bolts 109 and springs 110 interposed between the platform 108 and the heads 1090; of the bolts 109. If desired one end only of the platform 108 may be thus secured, and the other end may be secured by bolts 111 which permit only a slight play between the platforms 105 and 108. The strength of springs 110 is suficient to maintain the platforms 105 and 108, together during normal operation.

A pivot may be provided for the lever 22. The pivot may be made by bending ears 28 'upwardly from the platform 108. The pivot pin 29 may then be passed through the ears 28 and the lever 22.

Since pressure-responsive elements usually are not manufactured in quantities with the individual elements having the same resiliency, and in order to adjust the switch at any time, a resiliency adjustment may be provided. For this purpose a threaded rod 30 may pass through the arm 22 and through a sub-platform 31 made of insulating material and attached by bolts 31a to the platform 100. A disk 32 may be attached to the rod 30 and "a spring 33 may be interposed between the disk 32 and the sub-platform 31. By properly tensioning the spring 33 the upward and downward movement of the arm 22 may be regulated to any desired extent.

A snap action may be provided for the arm 22, and in this specific embodiment may comnestjes prise a two-way cam 40 mounted on the insulated sub-base 41 by any suitable means. The arm 22 may have a lever 42 pivoted by means of pin 43 and this lever 42 may be provided with a roller 44 riding on the cam 40.. A spring 45 may be attached by a hook 46'to the arm 22, and the other end of this spring may be attached to a threaded pin 47 passing through the bridge member 48 of the lever 42. A suitable knurled nut 49 may be provided to adjust the tension of the spring 45. 1t is thus seen that the tension of the spring 45 causes the roller 44 to ride on the cam 40 and provides a snap action for the lever 22.

Contact points may be connected and disconnected by the operation of the snap action. as herein shown, this may be accomplished by having the cam 40 pivoted at the pin 50. lt may have an extension 51 upon which thc Contact points 52 are mounted and to whichA the lead 53 is connected. Another contact point 54 may be mounted on the insulated sub-base 41. Thus it is seen that the passing of the roller 44 over the dividing point of the cam 40 causes the Contact points 52 to snap to and away from the contact point 54. A suitable upward limit pin 55 may be provided for the extension l51 of the cam 40. If desired, the Contact points 52 may be of the arc breaker is the first and last to make or break the circuit.

T he arm 22 may be provided with means for limiting its movement. As an example, an extension 55 may be provided on the arm, and extension 50 may be made integral with. platform 108.

During the normal operation of the switch, the platform 108 rests on the platform 105. However, if abnormal excessive pressures should be created in the pipe 21 the expansion member 20 would first cause the lever 22 to contact with extension 56. If further pressure should be created, the upward movement of the member 25 would cause the platform 108 to be lifted through the medium of the ears 28 and extension 56 from the platform 105., The springs 110 would provide the nec essary yielding play in the platform 108. Since the strength of these springs 110 is sufiicient to keep the platforms 105 and 108 normally in contact, the action of the switch would be regular except during such abnormal pressures as have been heretofore del scribed. The abnormal pressures only would have the necessary strength to Hex the s'l rings 110 from their normal positions. In t e embodiment shown the excessive pressures are due directly to refrigerant pressures. The excessive pressures, however,may be caused also indirectly, as bythe excessive pressures in a warm thermostatic bulb operating the pressure-responsive element.

The adjustments provided by rod 30 and pin 47 are related, but are for different pur type, in which the resistance contact piece 52 e switch opexpansion of said pressui r trate the testimony whereoif ll hereto ax my at 'which the s en operateso signature i at is, rod varies 'the value o the mean TT M. SUMit/SERS, im

j ressure of operation, L i? varies l ,e dierence between upper am Lower limits or operation. The tension on Ffer 42- mines the resistance' the 1 The position shown in Fig, mediately after the circuit cles fig snap ae- Sb pressures con e to bellows 20 me roller would continue downwardly the arm 25,3 would abut the er1.:-

tension 56., er further increase pressure would begin to lift the platform 1G8 the of the beilows, such as plate 23, would he platform The slight lifting of the roller le caused by lifting of 2n the platform 108 is insucient to cause a circuit breaking snap acticn., This slight lift is not sumcien't to carry the roller past the divider of the two-way cam 40, Any further pressure would then be carried by the plate 25 23 and platform 105 and no further strain would be placed on the operating lever mechanism. Because of the broad surface of contact at plate 23, the abnormal pressures do not deform the bellows. Since the platform .u 105 takes the load o abnormal pressures, the

lever system is not damaged.

While the form of embodimentof the invention as herein disclosed, constitutes a preferred form, it is to be understood that other 35 forms might be adopted, all coming-within thescope of the claims which follow..

What is claimed is as follows ;4

LI The combination, in controlling apparatus, of av member adapted to be moved from one position to another, a pressure responsive .device connected to said member, a4 pivot for said member, and means for moving said pivot only duri ng abnormal movement of said p pressure responsive device.

2. Switch operating mechanism including a yieldable support,an operating lever pivoted to 'said support, a pressure responsive device connected to said lever, a stop on said support for limiting the movement of said lever, said support being yieldable during abnormal expansion of said pressure responsive vdevice to permit movement of said stop member. 3. The combination, in controlling apparatus of a member adapted to be moved from one position to another, and pressure responsive device operatively connected to said member, a yieldable support for said memberr including a plurality of plates, one of said plates being movable with respect to the other, a stop member on said one of said plates and a spring member normally holding said plates together, said spring member permitting movement of said movable plate 

